Method of cross dyeing fabrics



Patented June so, 1931 UNITED STATES PATENT OFFICE ARTHUR S. BOBmTS, OF HENDEBSONVILLE, NORTH CABOLHTA METHOD OF CROSS DYEING FABRICS Ho Drawing. Application filed December 17, 1921, Serial re. 240,920. Renewed December 11, 1,930.

dvebath that will act to dye the cotton to My invention relates to a process of dyeing cotton and that type ,of regenerated cellulose known as xanthate silk or viscose when woven in the same fabric.

An object of my invention is to provide a combination of certain dyestufls and chemicals which will act to dye either the cotton or a type of regenerated cellulose and leave the other portion of the fabric undyed.

Another object of my invention is to provide a process of dyeing fabrics woven from cotton and certain types of regenerated cellulose in which the cotton may be dyed one color and the regenerated cellulose dyed another color..

I have discovered that certain basic dyestufis selected from the group consisting of hosphine G, Schultz Number 606, phloxine, hultz Number 596, methyl violet 2 B, Schultz Number 515," brilliant green crystals, Schultz Number 499 and the like, together with from three to five per cent of acetic, formic or sulphuric acid 3:2 degrees TW together with from two to four per cent of Glaubers salt or sodium sulphate, will, when introduced into a dye machine containing sufiicient water at a temperature of approximately 180 degrees Fahrenheit forma dyebath that will act to dye the viscose or xanthate silk to the color and shade desired and leave the cotton undyed or only slightly stained.

I have also discovered that certain selected substantive or direct dyes of the families represented by direct: yellow S 2 G, Schultz Number 10 which is produced by alkaline condensation and oxidation of paranitrotoluene sulphonic acid. One of the nitroso groups of the nitroso stilbene intermediate product (formed by the oxidation of the p nitrotoluene o sulphonic acid) is oxidized at the expense of the other and the remaining two nitrogenatoms of the two molecules combine-to form an azo-group in a di-stilbene molecule direct rubine B, concentrated Schultz No. 313 with or without an addition of sulphonated oil, will, when introduced into a. dye machine containing sulficient water at a temperature of approximately degrees Fahrenheit will form a for the viscose composed of one or more. of the basic dyestuffs is then madeup in a" pail of hot water and boiled until thoroughly dissolved. From three to five per cent gof 1 acetic acid, formic acid or sulphuric acid 32 de ress TW is then poured into the dye ma chine andv the dye machine filled up with The dyestufi" dye bath and itis then heated up to approximately water to the necemry extent. is next poured into the degrees Fahrenheit the goods are then run into the machine and given from three to five ends or dips in the dye liquor, or until the shade is of sufficient depth. The dye bath is then wasted and the goods given a thorough washing in cold water acidified with hydrochloric acid to clear the dyestufi from the cotton part of the fabric. The goods are again washed in cold water to remove the acid and the dye bath for the cotton is then made up.

The dye bath composed of one or more of the substantive or direct dyes are then put in water in a pail and thoroughly dissolved suflicient water is drawn into the machine, heated to approximately 120 degrees Fahrenheit, the dyestufi entered, and the goods run in and given from three to five ends or clips for the purpose of bringing up the shade desired on the cotton part of the fabric. This dyebath is then wasted-and the goods given rinsing to clear the-fabric of the surplus dyestufi, when it is squeezed and then dried.

Itis, ofcourse, tobe understood that. I may use one or more of either of the two groups of dyes to produce the shade-desired for either the viscose or the cotton portion i of the goods. 1

In the specification, I have set forth 9.

. preferred embodiment of my invention, and

although specific terms are employed, they are used in a generic and descriptive sense only, and not for purposes of limitation, the scope of my invention being set forth in the appended claims.

I claim:

1. That method of dyeing a fabric composed of viscose and cotton which comprises subjecting the fabric to a dyebath containing a basic dyestufi' selected from the group consisting of Schultz Numbers 606, 596, 515, and 499, sulphuric acid and sodium sulphate at a temperature of 180 F. and then subjecting the fabric to a dyebath containing substantive dyes selected from the group consisting of Schultz Numbers 10, and 313 at a temperature of approximately 120 F.

2. That method of cross-dyeing a fabric having viscose and cotton fibers therein which comprises subjecting the fabric to a dyebath containing basic dyestuff selected from the group consisting of Schultz N umbers 606, 596, 515, and 499, and an acidifying agent, at a temperature of approximately 180 F. and then subjecting the fabric to a dyebath containing substantive dyes selected from the group consisting of Schultz Numbers 10, and 313 to dye the viscose fibers one color and the cotton fibers another color.

3. That method of cross-dyeing a fabric containing viscose and cotton fibers which comprises wetting the fabic with cold water, then subjecting the fabric to a dyebath containing basic dyestuff selected from the group consisting of Schultz Numbers 606, 596, 515, and 499 and an acdifying agent at a temperature of 180 F. then washing the fabric in cold water acidified with hydrochloric acid, and then introducing the fabric into a dyebath contaning a substantive dyestuff selected from the group consisting of Schultz Numbers 10, and 313 at a temperature of approximately 120 F. whereby the viscose fibers are dyed one color and the cotton fibers dyed another color.

4. That method of cross-dye a fabric containing regenerated cellulose and cotton which comprises subjecting the fabric to a dyebath containing a basic dyestufl selected from the group consisting of Schultz Numbers 606, 596, 515, and 499 heated to approximately 180 F. and then subjecting the fabric to a dyebath containing substantive dyes selected from the group consisting'of Schultz N0. 10, and 313 approximately 120 F. whereby the regenerated cellulose fibers are dyed one color and the cotton fibers are dyed another color.

5. That method of cross-dyeing a fabric containing regenerated cellulose of the viscose type and cotton which comprises subjecting the fabric to a dye bath containing basic dyes selected from the group consisting of Schultz Numbers 606, 596, 515, 499, an

at a temperature of.

acidifying agent, heated to approximately 180 F. which acts to dye the viscose portion of the fabric and to leave the cotton portion undyed or only slightly stained.

6. That method of cross-dyeing a fabric containing regenerated cellulose of the viscose type and cotton which comprises subjecting the fabric to a dyebath containing sodium hydroxide, substantive dyestuffs selected from the group consisting of Schultz Numbers 10 and 313, at a temperature of approximately 120 F. which acts to dye the cotton portion of the fabric and to leave the viscose ,portion undyed or only slightly stained.

In testimony whereof I aflix my signture.

ARTHUR S. ROBERTS. 

